Safety glass sealing instrument



March 28, 1933. F. H. BELL' 1,902,987

SAFETY GLASS SEALING INSTRUMENT Filed Sept. 15, 1931 I Jwomhw l w w Patented Mar. 28, 1933 UNITED STATES FRANK H. BELL, 0F DETROIT, MICHIGAN, ASSIGNOR' TO GENERAL MoT TION, or DETROIT, MICHIGAN, A oonronn'rron orf nE AwAnE y sAEETY GLASS sEAmiqenvsTnuMEn 1 Application filed September 15, 1931;; Serlallllo; 56am.

This invention relates to instrumentalities for applying sealing orluting material to the edges of laminated transparencies of the type commonly known as safety glass. Transparencies of this type consist of two plates of glass and an interposed layer of tough flexible and transparent material bonded to the glass. The inter-posed flexible layer may be composedof cellulose nitrate, cellulose acetate, or any suitable substitute.

In order to preserve the non-splinterable property of these transparencies when subjected to a shock or blow it is necessary that the adhesion or bond between the flexible intermediate layer and the glass plates be maintained, because wherever the adhesion,

is broken the transparency is no longer nonsplinterable at the locality of the broken adhesion, which is commonly called in 'this-art a let-go. Furthermore, the let-goes are unsightly and interfere with vision.

One of the causes of let-goes is believed to be the penetration of water and moist atmosphere, under various temperature conditions, between the flexible layer and the glass plates, the moisture obtaining entrance at the edges of the assembly. Anothercause of let-goes in transparencies assembled by the use of adhesives or solvents and plasticizers used to render the flexible layer tacky preparatory to assembling, is believed to be due to evaporation of ingredients of adhesives and solvents. Deterioration of safety glass due to penetration of moist atmosphere and water and to evaporation of solvents, or other substances utilized to bond the glass and flexible layer, may be prevented or minimized by hermetically sealing or luting the edges of the assembly with a water resistant sealing or luting substance, which may be applied in more or less fluid condition.

In order most effectively to provide for retention of the sealing substance the intermediate layeris made of less area than the glass so as to leave a shallow channel for the reception of the sealing substance extending inward perhaps one eighth of an inch more or less. This channel may be formed by cutting the flexible intermediate sheet smaller v i which is threaded, and the bottom of which -Q than the glass or by routing out the flexible material to the requiredfdepthnfter the, flexible; layerand glassplates have been finally pressed together, p

This invention involves as, novel: form of nozzle, designed to constitute the terminal; of aiflexlble tube connected witha,source,ofiv

fluid. sealing orrluting substance under pres:

1156, the flow. of. whiclrmay. be controlled.by

In the accompanying drawing, Q Fig. 1 illustrates a complete e y gfll id ea a n es a valvennder: control of'the artisan.applying;

and;

formed 'in accordance with this dnvention. In the drawing, l0indicates-a receptacle contalning fluid, sealing material .which is.

under air; pressure supplied through a tube, p

11, from an. airh pump orv other. means fen compressing air not shown. A flexible-fle livery tube 12,, ise show'nconneeted .to a pipe atd n id vn into s al a diine he. receptaclelO. At-its delivery, end the flexible 1 tube. ll -is connected to valved control devicet 13' by which the discharge of the sealingfiuidi. may be controlled: Tl1e. ;combination thus fa-r describedds old; e i f This invention consists of a'nozzle attachment to the control device through which the sealing material may be extruded and neatly guided and deposited with facility into the sealing channel of the transparency.

The nozzle referred to is indicated byinu 5%;.

meral 20. It consists of a perforated cylindrical body 22 having an enlargedfiange 24, and a guiding groove 26 across the end of the body. The groove should be of a width to admit the edge of the transparency nicely within'it. The perforation comprises a small duct 28 ofa diameter approximately equal to the width of the space between the glass plates, and a larger hopper like cavity 30 in communication. The small duct terminates 0 1s consonaa'pparatusyfor t Fig. 2,,is1a; section on line 22, l

R g! 3ais, aperspectivewiew; o fgainozzlegg is provided with a hole through which the body 22 of the coupling may project. Thus the fitting 34 when screwed tight will compress the flange 24 tightly against the ends of the flow control device. r i

V Coupling 20 is preferably composed wholly of some slightly yielding elastic' material, preferably rubber, which will not scratch glass and which may be pressed yieldingly against the edge of the transparency during the operation of applying the sealing substance, and may be snugly coupledoto the end orvcontr-ol device on tube 12. But afnozzle wherein the guide groove is lined with yieldable elastic material gives good results.

In use the operator applies the nozzle to the edge of the transparency, the edge of the latter fitting within the groove 26. Then afteropening the control valve the nozzle is drawn along the edge toproject the sealing substance into the groove in the edge of the transparency. The form of the nozzle and V the elastic s'ubstance thereof enables the sealing substance to be deposited neatly and rapidly without permitting escape thereof in such mannerj as to smear the glass;

*lcl'aimz'f 1. An instrument for the purpose set forth comprising a nozzle having a transverse parallel sided guide groove the walls ofwhich I are of yieldable material anda duct opening into the groove.

2; Aninstrument for the purposeset forth comprising a'nozzle composed of yieldable material having a transverse parallel sided guide groove and a duct opening into the groove.

3; An instrument for the purpose set forth comprising a nozzle composed of rubber and 40' 7 having a securing flange, a transverse paral- ..sided guide groove, and a duct opening into the groove; r

In testimonywhereof I'affix my signature. FRANK H. BELL. 

